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    // screen  ->  屏幕对象(存放屏幕相关的信息)  window.screen

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    // screen的相关属性:
    // availWidth  availHeight 屏幕的宽高(不包含任务栏)
    // width       height      屏幕的宽高(包含任务栏)

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    console.log(screen.width,screen.height);





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